Inserted missing text "(Fig." on page 128: "Rice (Fig. 430a)."
Perhaps the reference to unit 408 on page 136 should be to unit 402; but it was not changed.
Changed "White-Pine" to "White Pine" on page 148: "White Pine and Basswood."
Changed "discovary" to "discovery" on page 160: "discovery of a wholly unsuspected kind."
Changed "sporo-carps" to "sporocarps" in the caption to figure 520.
Changed semi-colon to period after "microspores" in the caption to figure 522.
Changed "Lepreiurei" to "Leprieurei" in the caption to figure 561.
Changed "Sun-flowers" to "Sunflowers" on page 187: "Sunflowers and Thistles."
Changed "♁" to "♂" on page 189: "To indicate sexes, ♂ means staminate."
Preserved the order of the index entries, even though they aren't strictly alphabetical.